This meant that roofs that were made from.
Concrete roof tiles asbestos.
But other types of roof tiles containing asbestos also exist.
Regular flat shingle tiles standard lap are shown below as are common diamond shaped tiles and side lap tiles.
As a building material asbestos was very widely used between the 1950s and 90s especially as a roofing material due to its fire resistant properties.
The replacements for asbestos cement roofing products are reinforced with a variety of fibers including fiberglass.
Asbestos cement roof tiles are usually square shaped and their color is a combination of grey and black.
In the early 1920s american roofing material manufacturers johns mansville carey eternit and century were all offering at least one asbestos cement roofing shingle to their customers.
If the tile has less than 1 percent asbestos then the results are negative.
How to identify asbestos roof tiles.
Tiles which contain asbestos include mastic or bitumen based pressed metal roof tiles that were produced prior to the early 1980s.
Because there are fiber cement roofing products that replaced asbestos fiber cement roofing products that were subsequently made when asbestos use stopped and because those newer roofing products look so much like the older asbestos containing product without a marking stamped into the roofing material that gives an age product number or.
This type of roofing material can have various colors from different shades of grey to red green and even blue.
The fire resistant properties of these roof tiles weren t the only reason they were so popular as asbestos is incredibly durable and strong.
Other replacements for asbestos cement roofing use both different fibers and a different aggregate perlite to replace the asbestos.
The asbestos content will vary on the manufacturer but the content will typically be 15 or less.
Take the sample to an asbestos testing laboratory.
Some of the substitute products have been in use for more than 30 years 2008.
When replacing the tiles with safer options do not do so carelessly.
It may be difficult to find asbestos replacement tiles that match the original roof in color although we link to a page listing sources of asbestos tiles.
Just to make sure take two or three samples for comparison.
Asbestos roofing tiles are predominately comprised of cement.
The use of asbestos cement roof shingles was growing at a steady rate in the united states.
They can last for more than 40 years and if undamaged they pose little risk of exposure.
All mastic or bitumen based pressed metal roof tiles should be suspected of containing asbestos.
